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Capture and Immobilization of Exotic Small Ruminants

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Capture and Immobilization of Exotic Small Ruminants NAVC Conference 2009 ______________________________________________________________________________________________ CAPTURE AND IMMOBILIZATION OF EXOTIC blindfolded to reduce visual stimulation. If the head, SMALL RUMINANTS ears, antlers, or horns are manipulated then a halter can be applied and the head tied. Local anesthetic, sedation, Peregrine L. Wolff, DVM or immobilization agents can be administered within the Oregon Department of Fish and Wildlife chute. Corvallis, OR The design of the sorting and holding pens and runways leading to the chute should incorporate Nondomestic small ruminants can be encountered on principles developed for safely moving domestic cattle, exotic animal or cervid ranches on breeding farms, in sheep, and farmed deer. A circular pattern layout with, zoos or petting farms, and even as pets. Species non-slip solid footing, adequate lighting, and appropriate commonly kept outside of a zoological institution include: visual barriers are recommended for decreasing stress during the handling of any grazing species. Any Cervids: North American species such as elk (Cervus unnecessary noise should be minimized and lighting elaphus sp) white tail deer (Odocoileus virginianus) should be adequate but muted. Elevated catwalks and reindeer (Rangifer tarandus) or Eurasian species facilitate animal handling but should never go over the such as sika deer (Cervus nippon), fallow deer top of chute area as animals will become distracted by (Dama dama), axis deer (Axis axis), red deer (Cervus what is above them and reluctant and fearful to move elaphus), and muntjac (Muntiacus muntjak) forward. Animals should be restrained and handled Antelope: Scimitar-horned oryx (Oryx dammah), gently but firmly and it is important that they feel secure addax (Addax nasomaculatus), blackbuck (Antilope and balanced in the squeeze. Reports from feedlots cervicapra) have shown that gentle handling of cattle resulted in less bruising and neck or shoulder injuries, as well as a Nondomestic sheep and goat species: Mouflon (Ovis decrease in the number of sick animals and in the time it musiman), aoudad (Ammotragis lervia), bighorn took for animals to return to feed after being handled. sheep (Ovis canadensis), and mountain goats (Oreamnos americanus) IMMOBILIZATION If a chute system is not available or practical then To get “hands on” most exotic small ruminants will sedation or immobilization may be necessary. Extremely require manual restraint using a hydraulic squeeze or tame (hand raised) animals may allow administration of drop floor chute or immobilization The approach to anesthetic agents by hand syringe either intramuscularly restraint and anesthesia for these species will be (IM) or intravenously (IV). Pole syringes or jab sticks can governed by the level of habituation to handling and be utilized on animals that can be confined to small pens human contact, the handling facilities (holding pens, or stalls. Remote delivery systems involving darts (“flying raceways and squeeze chutes) available, and the animal syringes”) delivered by blow pipe, dart pistol or rifle are handling expertise of the caretakers. All ruminants are available (Telinject USA, www.telinject.com; DAN- prey species and flight is likely their first response to any INJECT of North America, www.daninjectusa.com; Pneu threat. The more intensively reared or tame the animals, Dart, www.pneudart.com) and can be utilized for animals the easier they will be to work and decreasing the flight in large pens or pastures. The Telinject and DAN- zone will make the capture or immobilization procedure INJECT darts utilize compressed air to depress the less unpleasant and stressful for the animal, the handler, plunger within the dart and the Pneu Dart system utilizes and the veterinarian. either a powder charge or spring and charge system. Pistols and rifles are powered by CO cylinders or .22 MANUAL RESTRAINT 2 caliber charges or compressed air. The Telinject and A properly set up chute and squeeze system is often DAN-INJECT darts and needles can be reused whereas the most economical, efficient and safest method for the Pneu Darts are designed for single use. Darts come handling exotic small ruminants. A standard squeeze in a variety of sizes from 1 to 10 mL. The Telinject and chute (with or without a head catch) is utilized for larger DAN-INJECT systems require larger rifle barrels for animals such as elk. A drop floor chute (where after darts over 5 mL, whereas any size Pneu dart fits within entering the chute, the floor is dropped leaving the their barrel. Pneu Dart barrels have also been animal suspended) is appropriate for deer and antelope manufactured to fit DAN-INJECT rifles so that these CO species. The drop floor chute decreases struggling and 2 powered rifles can fire Pneu darts. allows the animal to be safely handled with minimal stress. The width of the drop floor chute can be adjusted IMMOBILIZATION AGENTS to accommodate a variety of species. Most chute It is beyond the scope of this paper to list specific systems allow access to the front and rear of the animal drugs and dosages for exotic small ruminants. However, and also the back and legs, thus enabling the producer there are excellent references that provide such or clinician to perform routine husbandry procedures, information for all species.1-4 disease testing, and reproductive manipulations. The The ideal immobilization drug for any species has a tops of the chutes are wide to allow for horns and wide safety margin, small volume for delivery, and is fully antlers. Once in the chute the animal should be reversible. A small volume will facilitate rapid 366 Large Animal – Small Ruminants ______________________________________________________________________________________________ administration especially if remote delivery systems are greatly shortening recovery times over cyclohexylamine- used. Concentrated solutions of medetomidine (10, 20, based combinations. 40 mg/mL) are available (ZooPharm, The butyrophenone tranquilizer haloperidol along www.zoopharm.net). Ketamine can be lyophilized and with the long-acting neuroleptics (LANs) such as reconstituted at 200 to 250 mg/mL, although it often will zuclopenthixol and perphenazine are used to calm crystallize out of solution in cold temperatures. extremely flighty species before transport, group Tiletamine has largely replaced ketamine due to its introductions, or game auctions. These agents are greater potency and faster onset. Telazol (tiletamine 250 commonly used in wildlife capture in Africa. Long-acting mg and zolazepam 250 mg) is reconstituted with 5 mL of neuroleptics cause a decrease in motor activity, reduce sterile water per label instruction to a concentration of excitement, and relieve anxiety. Extrapyramidal side 100 mg of combined drug/mL. However, it can be made effects may occur from overdose or individual or species up with a smaller volume of water to increase the sensitivity and can range from repeated licking, chewing, concentration to 250 mg of combined drug/ml, or or facial movements to agitation, circling, and altered reconstituted with an alpha-2 agonist. It is important that levels of consciousness. bottles containing these cocktails are well labeled with Haloperidol is frequently administered to animals the resulting formulation including the mg/mL of each immediately at capture. It has a relatively short period of drug and the date of preparation. onset with initial sedation occurring within 15 minutes The potent opioids (carfentanil, etorphine, fentanyl) and lasting for 8 to 12 hours. It may be utilized as a sole or cocktails containing these drugs are often used in the agent or administered in conjunction with a LAN. As the immobilization of captive exotic or free-ranging small sedative effect of the haloperidol is decreasing the LAN ruminants. These agents meet the ideal drug profile in is beginning to take effect and sedation may last for 7 that they have a wide margin of safety for most hoofed to14 days. Haloperidol appears to be absorbed orally in animals, low delivery volume, and are fully reversible. ruminants and can be utilized in captive settings prior to However, many factors including high cost, stringent transportation, introductions, or medical procedures. regulations involving use of a Drug Enforcement Agency Schedule 2 narcotic, and human safety concerns make PLANNING AN IMMOBILIZATION the use of these drugs impractical for the average Attention to detail in preparing for a capture or practitioner. As an alternative all small ruminants can be immobilization may be the greatest predictor of a effectively and safely immobilized with drug cocktails successful outcome. Fear, anxiety, perception of danger, that do not contain these potent narcotics. novel environments, and crowded conditions all cause Alpha-2 agonists (xylazine, medetomidine, stress in animals and are usually present to varying detomidine) combined with a cyclohexylamine (ketamine degrees during a capture or immobilization event. Every or Telazol [tiletamine and zolazepam]) are the most effort should be made to reduce these stressors by; common non-narcotic mixtures used for immobilizing providing visual barriers (blindfolds), decreasing exotic hoofed stock. Cyclohexylamines have a wide extraneous noise (ear plugs, no unnecessary talking), margin of safety; however, the volume of delivery, having an adequate number of well-trained animal especially with ketamine, is large and they cannot be handlers, and utilizing proper equipment and facilities.
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